CS201576B1 - Furnace for glass melting or remelting - Google Patents

Description

CZECHOSLOVAKKÁSOC IALISTIC DESCRIPTION OF THE UNDERSTANDING 201576 (11) (Bl) R E P U B L 1 (19) C A CERTIFICATE OF CERTIFICATE (51) Int. Cl3 C 03 B 5/00 (22) Registered 14 11 70 (21) (PV 7689—70) OFFICE AND DISCOVERY LEZY Y (40) Published 31 03 80 (45) Published 31 03 82 (75) ", _.,

The inventor HÁJÍČEK OTO dr. ing., PRAGUE, KOMÍNEK MIROSLAV, HNĚVOTÍN,

HÁJÍČEK JIŘÍ ing., NOVÝ PAVEL and SEMÍKOVÁ JITKA, PRAGUE (54) Glass melting or melting furnace

BACKGROUND OF THE INVENTION The present invention relates to a furnace for melting or fusing glass, in particular a furnace, for elongating glass fibers.

Melting and remelting furnaces, in particular for drawing glass fiber, still made predominantly of platinum, since it is considered to be a completely neutral metal relative to the enamel. Glass fiber glass, particularly with boron additive and a set temperature of up to about 1400 ° C, must be maintained at a temperature of about 1500 ° C and the ultra-stress platinum furnace both thermally and mechanically. Considering that the platinum melting temperature is about 1,770 ° C, the difference between this temperature and the enamel holding temperature is not 1500 ° C and the platinum failure is more than understandable in this case. Taking into account that roughly half the absolute temperature, the strength of all metals is approximately the same and decreases as the temperature rises to zero at the absolute melting temperature, platinum failure is even clearer. Other platinum group metals of higher melting temperature, such as iridium or osmium, are even more deficient and costly than platinum.

Metals, the melting temperature of which is considerably higher than the holding temperature of these raw materials, and which at these temperatures will be neutral for enamel and do not impair the enamel. This includes, but is not limited to, refractory metals such as molybdenum with a melting point of 2 620 ° C or tungsten with a melting point of 3 370 ° C, or other metals refractory with higher melting temperatures and which do not adversely affect the glass. However, they have a number of other drawbacks, including high oxidisability, which is so disastrous for some of these metals that the higher temperatures in contact with air are practically disintegrating.

The invention overcomes all of these disadvantages, in that the refractory metals used to make the glass melting or refractory furnace are a continuous and non-continuous layer of high-melting masses of a group comprising melted corundum or siliconized silicide on both sides. aluminum. It is then used to make such remelting furnace some metal of the creep metal group and provide it with a protective layer contiguous and continuous to prevent oxidation. It is worth mentioning that primers, such as molybdenum or tungsten, are continuously and continuously applied, which is just achieved by the plasma torch, which ensures a complete airtightness and impermeability of such a protective coating.

Claims (1)

2 ku. Regarding the calibrated nozzles for the remelting furnace required to draw the customary fiber, it is used with nozzles made in the usual manner from any metal or metals of the platinum group and inserted into this new bottom. The advantage of this new solution is the fact that platinum is not used to produce such a melting or forging furnace at a desired temperature for some time, but some of the refractory metals which still exhibit considerable strength at these temperatures. Since these refractory metals are more than 100 to 200 times cheaper, the acquisition and maintenance costs of these furnaces are substantially reduced. OBJECT VY ř A glass for melting or remelting glass, in particular for drawing glass. of fibers, consisting of walls, bottom and lid, characterized in that it is made of one of the refractory metals, molybdenum and tungsten; and the lids were made from a 1 mm molybdenum to which a fused corundum coating of 0.2 mm and 2 mm thickness was sprayed with a plasma torch. Platinum and rhodium alloy nozzles were inserted into the bottom part of the same fabric. These parts were subjected to the same stresses and conditions as would be the case with remelting furnaces (molten glass-boron additive, interface of this enamel and air). These parts were overloaded for almost 9 months without any damage, so much as today's remake. Molybdenum is not as deficient as platinum, and moreover, it is 100 to 200 times cheaper. The coating is provided on both sides with a continuous and discontinuous coating, a layer of at least 0.2 mm thick of at least one high melting mass of the group consisting of fused coarse, silicon silicide and aluminum silicide. and/; Jihočeské tiskárny, n, p., Operation 6 · Jindr. HradecPrice: 2.40 Kčs